Ghostwriter

Last night I got attacked for my ability as a writer by a client on Upwork www.upwork.com/freelancers/~0115a52654d3cda29a. In itself, this was bad but not devastating for me, as I have far more praises than negative comments on my work.

This morning, the comments made raised a question in my mind that lead to a train of thought. If the was so adamant my work was so bad, why didn't he write his own story?

I have often explained why I chose to become a ghostwriter, but I wonder why people choose to have somebody write their stories for them?